Hubby and I always joke that it is a good thing that our cat doesn't have thumbs. He loves pens, and would watch me for ages while I was working with pen and paper while studying. If I left the table he would try to "work" the pen. A few times he did manage to mark on my papers.

We always thought he was trying to write his plans for world domination...but maybe he was simply trying to organize a group of cats for a milk run!